Java Color Blend blend(Color origin, Color over)

Description

Blends two colors to create a new color.

License

Open Source License

Parameter

Parameter	Description
origin	the base of the new color
over	the alpha-enabled color to add to the origin color

Return

a new color comprised of the origin and over colors

Declaration

public static Color blend(Color origin, Color over) 

Method Source Code

//package com.java2s;
/*//w  w w . j av a2s . c  om
 * $Id: ColorUtil.java 3742 2010-08-05 03:25:09Z kschaefe $
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

import java.awt.Color;

public class Main {
    /**
     * Blends two colors to create a new color. The {@code origin} color is the
     * base for the new color and regardless of its alpha component, it is
     * treated as fully opaque (alpha 255).
     * 
     * @param origin
     *            the base of the new color
     * @param over
     *            the alpha-enabled color to add to the {@code origin} color
     * @return a new color comprised of the {@code origin} and {@code over}
     *         colors
     */
    public static Color blend(Color origin, Color over) {
        if (over == null) {
            return origin;
        }

        if (origin == null) {
            return over;
        }

        int a = over.getAlpha();

        int rb = (((over.getRGB() & 0x00ff00ff) * (a + 1)) + ((origin.getRGB() & 0x00ff00ff) * (0xff - a)))
                & 0xff00ff00;
        int g = (((over.getRGB() & 0x0000ff00) * (a + 1)) + ((origin.getRGB() & 0x0000ff00) * (0xff - a)))
                & 0x00ff0000;

        return new Color((over.getRGB() & 0xff000000) | ((rb | g) >> 8));
    }
}

Related

1. blend(Color c1, Color c2, double v)
2. blend(Color cFrom, Color cTo, float factor)
3. blend(Color col1, Color col2, float weight1)
4. blend(Color color1, Color color2, float ratio)
5. blend(Color color1, Color color2, int factor)
6. blend(Color pColor, Color pOther)
7. blend(double factor, Color color1, Color color2)
8. blend(final Color color1, final Color color2, final double ratio)
9. blend(final Color first, final Color second, final float alpha)